Kir2.1

Kir2.1 is a protein that in humans is encoded by the KCNJ2 gene. It is a member of the inward-rectifier potassium channel family and is predominantly expressed in the heart and neurons.

Function

Kir2.1 is a strong inward rectifier K+ channel. The inward rectification is mainly due to the blockage of outward current by internal Mg2+ and polyamines. This channel is a major contributor to the native inward rectifying K+ current in heart and neurons.

Clinical significance

Mutations in the KCNJ2 gene are associated with Andersen-Tawil syndrome, a rare disorder that affects the heart, facial features, and muscle movement. This condition is characterized by a triad of distinctive features: periodic paralysis, heart rhythm abnormalities (arrhythmias), and developmental abnormalities.

See also

• Inward-rectifier potassium ion channels
• Andersen-Tawil syndrome

External links

• KCNJ2 at the US National Library of Medicine Medical Subject Headings (MeSH)